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MySQL 5.5 Reference Manual
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MySQL 5.5 Reference Manual  /  The InnoDB Storage Engine  /  InnoDB Fast Index Creation

14.16 InnoDB Fast Index Creation

In MySQL 5.5 and higher, or in MySQL 5.1 with the InnoDB Plugin, creating and dropping secondary indexes does not copy the contents of the entire table, making this operation much more efficient than with prior releases.


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